Redsn0w 0.9.14b2 update adds support to downgrade iPhone 3GS baseband 06.15.00 to regular iPhone baseband and an additional feature of DFU Mode which can make it possible for your iDevice to get into DFU Mode for jailbreak if it has any issue with hardware or Home button.
Now, if you have an iPhone, iPod touch or iPad with broken Power or Home button then check out the guide below where Redsn0w 0.9.14b2 put your iDevice into DFU mode easily.
Enter into DFU Mode with Broken Buttons using Redsn0w
Unzip RedSn0w and run RedSn0w application file
Click “Extras” > “Even More” buttons on RedSn0w screen
From “Even More” options, click “DFU IPSW”
“DFU-mode IPSW workaround” message box will display, click OK button
Select your downloaded IPSW firmware file
RedSn0w will start “Creating DFU-mode IPSW”
When IPSW will get created, “IPSW created” notification will display so click OK button
Open iTunes and attach your iDevice to system, and select it in iTunes from list of devices in left panel
Note: Backup your iDevice
In iTunes under “Summary”, Press and hold “Option” key and click “Restore”
Select “ENTER_DFU IPSW” from your desktop which is just created in step-7 and click “Open” button
When Restore process will complete, your iDevice will be into DFU mode. Now, you can continue for jailbreak process and that’s it